Support for simulating ATtinyx5 (e.g. ATtiny85) timers #64
Description
ATtiny devices use a single TIFR that is shared among both timers. Same goes for TIMSK. Thus, the bit indices for these registers are different and are timer dependent. For instance, TOV0 is second least significant bit, while its current value is hardcoded to the least significant bit.
We need to make TOV / OCFA / OCFB bit positions configurable, as well as TOIE, OCIEA and OCIEB.